I would highly recommend you do not drain the fuel tank, you should leave it with a full tank to minimize the amount of room for moisture in the air to condense. Too much moisture in your tank can cause it to rust from the inside out if it’s steel.
Okay so flying kites is a very good time. Two line sport kites can be reasonably cheap and easy to learn. You can transition into larger power kites that are a total blast and quite a workout to control. I’ve never done it but you can move up to kiteboarding or similar sports as well.
It’s a diesel engine, but that’s excellent advise for anyone with a gas engine that comes across this post!